<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>HLS</title>
  </head>
  <body>
    <div class="A">A</div>
    <div class="B">B</div>
  </body>
  <style>
    .A,
    .B {
      width: 100px;
      height: 100px;
    }
    .A {
      background: rgba(52, 152, 219, 1);
    }
    .B {
      /* background: hlsa(204deg, 70%, 53%, 1); */
      background: hsla(204deg, 70%, 53%, 1);
    }
  </style>
</html>
